Bearing for grinding apparatus.



E. RIVETT. BEARING FOR CIRINDING APPARATUS.

APPLICATION PILLD MAR. 2s, 1907.

Mdm/ess es:

UNITED sTATEs PATENT oEEreE.

EDWARD RIVETT, OF BOSTON, MASSACHUSETTS.

BEARING-FOR GRINDING APPARATUS.

To all whom it may concern:

B'e it known that I, EDWARD RIVETT, a citizen of the United States, residing in Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Bearings for Grinding Apparatus, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention has for its object to improve the type of grinding machine represented in United States Patent No. 652,007, granted to me and dated June 19, 1901, the improvement 1 tending to insure greater steadiness of rotation ofthe tool carrier, and consequentlyv greater accuracy in grinding work to be acted upon by the tools.

In the patent referred to the spindle was substantially .cylindrical at each side of a central fixed collar, and a compressible box slitted inwardly from its opposite ends fitted the same at each side of said collar, the exterior of the slitted box being acted upon byo the straight sides of wedges guided 1n and carried by holders )inclosed in sleeves fixed within the opposite ends of a quill, the adjustment longltudinally of the holders in the sleeves causing the latter in their movement in said sleeves to act on the tapered outer sides of the wedges which were restrained against longitudinal movement, causing the wedges to contact with the slotted box to hug more closely the spindle to thereby take up any wear and insure accuracy ofwork.

In my present invention I have devised a hollow multipart spindle comprising essentially two conical sleeves or shells and a means for connecting and holding the ends of the same to ether firmly. y

Fi e 1 in ongitudinal section shows a grin g apparatus embodying my invention; Fig. 2 1s a section looking to the left of the dotted line x, Fig. 1; Fig. 3 shows one of the lsleeves detached and partially broken out to illustrate the bearing holder therein, the holder being partially broken out to show one of the screws extended therethrough to confine the plate closing the inner end of the sleeve ,'Fi 4 shows an end view of the bearing holder; ig. 5 shows the bearing detached, and Fig. 6 shows one of the plates c detached.

Referring tothe drawing, A in dotted lines shows part of a bearing or head in which is sustained a quill a common to said patent,

Specification of Letters Patent.

Application led March 23, 1907.

Patented March 2, 1909.

Serial No. 364,963.

said quill at its opposite ends receiving sleeves d rovided one with a right and the other with) a left thread to be screwed inte the ends of the quill, the sleeves being held in place in the quill by set screws a2, 'all as in said patent.

I will now describe the novel features of my present invention to be hereinafter claimed. I

Within each sleeve I insert a bearing holder B shown detached in Fi 4, the same beingf'cylindrical externally to t the interior of the sleeve, see Fig. 1, and provided with a tapered hole, the hole being smaller nearest the ends of the quill. In the hole in the bearing holder I insert an anti-friction bearing C having a series of holes for the passage of and for holding any lubricating material, said bearing being herein represented as having a spiral slit from one to its opposite end that it may, by pressure exerted on its outside, be contracted. After inserting the bearing holder and bearing in the sleeve, I-

apply to the open inner end of each sleeve a clrcular plate c having a series of oil holes 3, and other screw threaded holes cx, see Fig. 6.

I insert through holes in the outer ends of the heads of the sleeves a plurality of screws c', said screws assing loosely through holes in the bearing older and having their screw threaded ends threaded for a short distance into threaded holes of the plates c, the latter plates contacting with the inner ends of the bearing holders, the outer ends thereof contacting with the inner sides of the heads of -the sleeves. The outer end of each sleeve carries two screws d d, both being shown in Y elevatlon 1n Fig. 1. Each screw d has a collar that contacts with the inner side of the head of the sleeve, see left of Figi 1, the head being extended outwardly througha hole in the head of the sleeve to be enga ed by a wrench, and the threaded part of t e screw enters a threaded hole in the holder, the rotation of said screw causing the holder to be moved longitudinally into the sleeve. The screws d2 are merely holding or stop screws that are turned in after adjusting a holder by turning a screw d Instead of using a solid spindle as 1n my said atent, I have made a multipart hollow spin le which, as shown, comprises two hollow sleeves e, e having res ectivelyat thelr inner ends flan es e, e3. he sleeves are tapered external y and internally, see Flg. -1, and provided with oil holes 2, the inner ends of the hollow sleeves being united by a bushing e4 tapered externally at its opposite ends, to enter and lit the internal taper at the inner ends of said hollow sleeves, the opposite ends of said bushing being shown as of different diameter. Aftery the parts e and e4 of the spindle have been forced firmly in contact, as in Fig. 1, I slip onto the end of the right hand sleeve, see Fig. 1, a ring f having at one end an inturned flange that abuts the outer side of the flange e3 while the opposite end of said ring overlaps the flange e2 and abuts an antifriction washer f2 that contacts with the inner side of the left hand sleeve, Fig. 1, a second washer f3 which may be of metal being interposed between the headv e2 and the anti-frict1on washer f2. The right hand hollow sleeve is surrounded by an anti-friction washer f4 that is interposed between the plate closing the inner end of the right hand holder and the flanged end of the ring f.

The outer end of the left hand hollow sleeve e has driven into it from its inner and larger end an externally tapered bushing g screw threaded internally, and the outer end of said hollow sleeve is tapered to receive over it, when extended beyond the sleeve d the internally tapered hub of a driven pulley B2 designated by like letter in said patent, it being understood that the tapered outer ends of both said hollow sleeves when protruded from the sleeves and beyond the end of the quill, will be provided with a pulley as B2 so that two belts, one on each of said pulleys, may drive the spindle in the bearings at an excessively high speed, twenty-five to seventy-five thousand perminute without any unsteadiness.

The pulley B2 at the left in Fig. 1 is forced onto the tapered end of sleeve e by the head of a screw g as the threaded shank of said screw is screwed into the threaded hole of the bushing g. The ulley B2 at the right of Fig. 1 has an interna ly tapered hole 1n its hubsli ped yover the tapered outer end of the right hand sleeve, and is forced thereon to a snug driving lit by a tleaded rlng h screwed onto a threaded portion 5 ofthe -outer end of a bushing h tapered externally and forced into said right hand sleeve from its inner end,

the externally tapered end of said 'bushing fitting the interior ta ered Wall of said sleeve, the smaller end of t e bushin being forced beyond the outer end of the s eeve, see Fi 1. The bushing is provided internally wit screw threads entered by the screw threaded shank m, .of the tool holding part or extension m of the spindle.

In assembling the parts, the sleeve at the leftof Fig. 1 .with its holder, bearing, and late maybe inserted into the uill from its eft hand end, and the end of the lvft han hollow s indle with its ashers, rin f and toolhol er m but without the pu ley B2 grnay be inserted into the `right hand end of the quill until the washer f3 meets the antifriction washer, and thereafter the sleeve at the right, Fig. 1, with its contained parts will be screwed into the quill until the plate at its end contacts with the anti-friction washer f4. applied to the end ofthe spindle.

The uill and its entire contents may be remove from the head A, as an entirety, as provided for in said patent.

Oil or other lubricant filled into the quill when assembling the parts will pass through the holes in the plates c, through holes in the bearings and entering the hollow s indle will keep the spindle highly lubricate If the bearings or spindle wear, by turning the screws d', d2 the holders may be adjusted toward the ring f and in so doing will compress the bearings causing the same to fit the exterior of the spind e snugly so that there can be no lost motion or jar.

The a paratus herein shown may be used After this the pulley B2 will be as and or the purposes fully described in said patent.

Havingdescribed my invention, what I claim as new and desire to secure by Letters Patentl is 1. In an apparatus'of the class described, a rotary multi-part spindle comprising a plurality of hollow externally tapered sleeves, a bushing having tapered ends engaging the inner ends of and connecting said sleeves, and bearings embracing the exterior of said sleeves and in which the spindle rotates.

2. A multipart spindle comprising a plurality of hollow externally ta ered sleeves, and means for connecting said slleeves at their inner ends, combined with bearings embracing the exterior of said sleeves, and means for sustaining said bearings.

3. A multi artxspindle comprising a plurality of hol ow externally tapered sleeves, means for connecting said sleeves at their inner ends, and an exteriorly tapered bushing projected beyond the smaller end of one of said sleeves. A

4. A multipart spindle comprising a plurality of hollow externally tapered sleeves, means for connecting said sleeves at their inner ends, and an exteriorly tapered bushing projected beyond the smaller end of one of said sleeves, combined with a pulley applied to -the outer end of said sleeve and means a plied to said bushing for forcin said pu ey onto the tapered end of sai sleeve.

5. A multi art spindle comprising a plurality of hollow externally tapered sleeves, means-for connecting said sleeves at their inner'ends, and an exteriorly tapered bushing projected beyond the smaller end of one of said sleeves, combined with a pulley applied to the outer end of said sleeve, means tool holder carried by said bushing and revoluble with said spindle.

6. A quill, two sleeves applied to the outer ends of said quill, a bearm holder and a tapered bearing applied insi e each sleeve, a plate at the inner end of each sleeve, a multipart hollow spindle tapered externally, means to connect a plate'to each sleeve,'and means to adjust said bearing holders longitudinally in said sleeves over said bearings.

7. A quill, two sleeves applied to the outer ends ofsaid quill, a bearm holder, and a ,tapered bearing applied inslde each sleeve,

a plate at theinner end of each sleeve, a multipart hollow spindle tapered externally,

Ymeans to adjust said 'tudinall 1n sald sleeves over said bearln s,

means to connect a plate to each sleeve,

earing holders longitwo pul e s mounted on said spindle, an a ring, the atter bein rotatable inthe s ace between the plates c osing the inner en s of said sleeves.

In testimony whereof, I have signed my name to this speciication, in the presence of two subscribing witnesses.

EDWARD RIVETT.-

'Witnessesz GEO. W. GREGORY, EvANGELINE C. BROWN. 

